Donald Trump is probably feeling that familiar shame of being utterly shut down by Harry Potter's JK Rowling once again.

Rowling has been making a habit of thwarting the US president every time he spouts off with one of his bizarre Twitter rants, and her reaction to Trump's latest tirade against the CIA is perhaps her wittiest yet.

Trump unloaded all of his fury on Twitter on Wednesday (May 3) as rumours heated up about a potential FBI investigation into connections between his presidential campaign and the Russians.

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